Release v0.9.9

Code formating

support custom ssl ctx configuration for SSLServer (yhirose#1073)

Fix yhirose#1069 (yhirose#1070)

Split the header only if needed (yhirose#1060)

* Update split.py

* Update split.py

* Update split.py

* Update split.py

Fix "Issue 37742 in oss-fuzz: cpp-httplib:server_fuzzer: Timeout in s…

…erver_fuzzer"

Append '_Online' suffix to Unit test names that access external servers

Allow `LargeRandomData` test only on Windows

Added a test case for yhirose#996

Updated copyright year